Edwards is facing charges that he knowingly misused nearly $1
million campaign funds to support and hide his pregnant mistress,
Rielle Hunter, from the public.

Young is considered the prosecution's key witness, and already,
his testimony has provided new details for case, including how
Edwards would typically send Hunter $5,000 a month, though
sometimes he would sent up to $12,000,
according to CNN.

Here are some more details from Young's testimony:

According to Young, when Edwards first heard about Hunter's
pregnancy, he called her a "crazy slut" and said that there was a
"1-in-3 chance it was his child." (via
CNN)

As far as how the money was delivered, Young explained that
philanthropist Rachel "Bunny" Mellon would make personal checks
out to her interior decorator, who would then co-sign checks with
Young's wife, using Young's wife's maiden name. She would then
deposit the check into their own account. (via
ABC News)

Young first began to suspect Edwards was having an affair
with Hunter in September 2006, when he invited her to shoot his
campaign videos. (via CNN)

During that time, Edwards made several calls to Hunter, Young
said. He added that at one point, he heard Edwards cough while
talking with Hunter on the
phone. (via CNN)

Young also said that for the first time ever, Edwards asked
Young to carry his bags for him while he was with Hunter. Then,
at the end of the trip, Edwards personally took Hunter to the
airport — something he never had done for the staff before.
(via CNN)

Edwards' wife began to suspect an affair after she picked up
a call from Hunter and let her talk without responding, Young
explained. He said she then hung up and told Edwards to fire
Hunter. (via ABC
News)

Edwards' defense attorneys, however, quickly challenged Young's
credibility, saying that he consulted with three other witnesses
about his testimony and that he was a greedy staffer. After the
scandal broke, Young wrote a book called "The Politician:
An Insider's Account of John Edwards's Pursuit of the Presidency
and the Scandal That Brought Him Down." The defense
also noted that Young too had an affair with a campaign employee.